Fresh Air Refreshes Totally (F.A.R.T.) was a fringe movement of wizards who preferred to wear robes at all times in public, even when in the vicinity of Muggles, because they believed that trousers "stem[med] the magical flow at source" and that having a "healthy breeze" around one's "privates" was desirable.[1][2] The movement's president was Archie Aymslowe.[1]

Members of the F.A.R.T. movement were repeatedly warned and fined for violating the International Statute of Wizarding Secrecy.[1] The Statute laid out a code of dress that wizards and witches were supposed to follow when interacting with Muggles.[1]

Muggles who encountered members of the F.A.R.T. movement apparently assumed they belonged to a cult.[1]

Etymology

The movement's acronym, F.A.R.T., is clearly a play on the English vulgarism fart, an informal term referring to flatulence. The full form itself appears to be a play on the term.